net: microchip: Remove unneeded variable ret

Remove unneeded variable ret used to store return value.

Signed-off-by: Xu Wang <vulab@iscas.ac.cn>
Link: https://lore.kernel.org/r/20201023092107.28065-1-vulab@iscas.ac.cn


Signed-off-by: Jakub Kicinski <kuba@kernel.org>